Every Summer Houston restaurant sponsors what is known as "Restaurant week" . It is more like Restaurant Month though. Many large cities also participate throughout the year so check for you city. You are gonna have to google it yourself but some cities include:

NYCBOSTONSAN DIEGOPROVIDENCEBALTIMORE

This benefits both a charity and allows you and your favorite date to go out for night without breaking the bank. To see a list of participating restaurants in Houston click here